--- title: "L-Tryptophan vs DSIP: Side-by-Side Comparison (2026)" url: https://www.bodyhackguide.co/compare/l-tryptophan-vs-dsip description: "Compare L-Tryptophan vs DSIP side by side. We earn a commission on some vendor links. Mechanism, half-life, dose range, side effects and prices." lang: en --- Skip to content Compare notes on r/BodyHackGuide (https://reddit.com/r/bodyhackguide) Compare notes with other researchers. Join r/BodyHackGuide (https://reddit.com/r/bodyhackguide) # L-Tryptophan vs DSIP (Delta Sleep-Inducing Peptide) Side-by-side comparison of L-Tryptophan and DSIP (Delta Sleep-Inducing Peptide): mechanism, half-life, dose range, safety profile, and vendor pricing. L-Tryptophan: no price on file DSIP (Delta Sleep-Inducing Peptide) from $34.99 ## Price snapshot ### L-Tryptophan Current low — 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ### DSIP (Delta Sleep-Inducing Peptide) Current low $34.99 current listings 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ## L-Tryptophan L-Tryptophan is one of the nine essential amino acids — meaning the human body cannot synthesize it and must obtain it from dietary protein — and is the direct metabolic precursor to serotonin, melatonin, and (via a… No vendor price on file. Full L-Tryptophan profile (https://www.bodyhackguide.co/compound/l-tryptophan) ## DSIP (Delta Sleep-Inducing Peptide) Delta sleep-inducing peptide (DSIP) is a nonapeptide — a 9-amino-acid neuropeptide with sequence Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu (WAGGDASGE, 848 Da molecular weight) — first isolated in 1977 from the cerebral venous… **Lowest listed price:** $34.99 across 11 listings Full DSIP (Delta Sleep-Inducing Peptide) profile (https://www.bodyhackguide.co/compound/dsip) ## Side-by-side comparison | Attribute | L-Tryptophan | DSIP (Delta Sleep-Inducing Peptide) | | --- | --- | --- | | Category | Nootropic | Cognition, Mood & Neuroprotection | | Research Stage | Preclinical | Research Use Only | | Mechanism of Action | L-Tryptophan acts primarily as the upstream precursor to serotonin, melatonin, and — via the dominant kynurenine pathway — NAD+ and a family of bioactive metabolites. Its pharmacology is metabolism-driven: tryptophan itself has no direct receptor binding of… | Primary Mechanism: Uncharacterized Direct Receptor Binding After more than four decades of research, DSIP's primary molecular target remains unknown. No specific receptor has been cloned, characterized, or reproducibly identified as the primary binding site… | | Half-Life | — | ~7-15 minutes (IV; plasma clearance is rapid, though subjective sleep effects can outlast measurable blood levels) | | Typical Dose Range | — | 100–300 mcg per injection | | Dosing Frequency | — | Once daily, 30–60 minutes before bedtime | | Administration | — | Subcutaneous, Intramuscular, Intranasal | | Side Effects | L-Tryptophan has a generally favorable side effect profile at standard doses in quality-sourced product, but several considerations — particularly serotonin syndrome risk and the 1989 EMS legacy — warrant specific attention. Gastrointestinal effects — the most… | Overall Safety Profile DSIP has one of the cleanest safety profiles of any peptide in the research chemical space. In 40+ years of research and clinical use, no serious adverse events have been reported in controlled trials or large case series. The compound… | | Molecular Weight | — | 848.8 Da | | Common Vial Sizes | — | 2mg, 5mg | ## Price History 8 data points - BM - Half Nattys - LB - Ion Peptide - OF - Disguised Alpha - BHG Labs ### L-Tryptophan: potential benefits - No structured benefit list published. ### DSIP (Delta Sleep-Inducing Peptide): potential benefits - Sleep quality support - Stress reduction - Cortisol/HPA modulation - Alcohol & opioid withdrawal support - Circadian regulation ## Frequently asked ### What's the difference between L-Tryptophan and DSIP (Delta Sleep-Inducing Peptide)? L-Tryptophan is a nootropic that l-tryptophan acts primarily as the upstream precursor to serotonin, melatonin, and — via the dominant kynurenine pathway — nad+ and a family of bioactive metabolites. its…. DSIP (Delta Sleep-Inducing Peptide) is a cognition, mood & neuroprotection that primary mechanism: uncharacterized direct receptor binding after more than four decades of research, dsip's primary molecular target remains unknown. no specific receptor has been…. The two differ in mechanism, half-life (not reported vs ~7-15 minutes (IV; plasma clearance is rapid, though subjective sleep effects can outlast measurable blood levels)), and typical dose range. ### Which has the longer half-life, L-Tryptophan or DSIP (Delta Sleep-Inducing Peptide)? L-Tryptophan has a half-life of not reported. DSIP (Delta Sleep-Inducing Peptide) has a half-life of ~7-15 minutes (IV; plasma clearance is rapid, though subjective sleep effects can outlast measurable blood levels). Longer half-lives generally mean less frequent dosing but slower on/off kinetics. ### Can you stack L-Tryptophan and DSIP (Delta Sleep-Inducing Peptide)? Stacking depends on mechanism overlap, safety profile, and goals. L-Tryptophan and DSIP (Delta Sleep-Inducing Peptide) should only be stacked after reviewing each compound's individual protocol page, side effect profile, and any published interaction data. Use the BodyHackGuide stack builder for a structured review before combining research compounds. ## See current vendor prices Listings from the vendors we track. Prices change often, so check the vendor before you buy. L-Tryptophan prices: https://www.bodyhackguide.co/compound/l-tryptophan?tab=prices DSIP (Delta Sleep-Inducing Peptide) prices: https://www.bodyhackguide.co/compound/dsip?tab=prices Compare all compounds: https://www.bodyhackguide.co/compare ### Before you buy L-Tryptophan or DSIP (Delta Sleep-Inducing Peptide) Check the vendor trust score. Every supplier we track is rated 0-100 on COA verification, payment transparency, shipping, reviews, and listings: one published, reproducible methodology, applied to every vendor. View Vendor Scorecard (https://www.bodyhackguide.co/vendors/scorecard) ## Related comparisons DSIP vs Melatonin: https://www.bodyhackguide.co/compare/dsip-vs-melatonin **Research use only.** BodyHackGuide is a research and price-comparison reference. The compounds discussed on this page are not approved by the FDA for human consumption and are sold strictly for laboratory research. Prices shown are pulled from vendor listings tracked on BHG and are subject to change. We earn an affiliate commission on some outbound clicks, and every vendor is ranked on the same public, reproducible methodology. See editorial standards (https://www.bodyhackguide.co/editorial-standards) and affiliate disclosure (https://www.bodyhackguide.co/affiliate-disclosure). 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